#include <stdio.h>
#include <math.h>
int main()
{
    int a, b, c, count = 0;
    printf(" there are different methods for XM to distribute books to 3 readers:\n");
    for (a = 1; a <= 5; a++)
    {
        for (b = 1; b <= 5; b++)
        {
            for (c = 1; a != b && c <= 5; c++)
            {
                if (c != a && c != b)
                {
                    printf(count % 8 ? "%2d:%d,%d,%d\n" : "%2d:%d,%d,%d\n", ++count, a, b, c);
                }
            }
        }
    }
    return 0;
}